Selectionist theory in psychology conceptualizes behavior as a dynamic phenomenon subject to a variation and selection process similar to that characterizing biological evolution. Though not formally recognized as a dominant psychological metatheory, selectionist thought can be identified in the writings of many of the discipline's eminent scholars. Although selectionism may possess considerable promise as a unifying theory, its widespread acceptance has likely been impeded by the large sample, null hypothesis testing research designs associated with the Fisherian tradition.
Morgan, David L.
"Selectionist Thought and Methodological Orthodoxy in Psychological Science,"
The Psychological Record: Vol. 48
, Article 7.
Available at: http://opensiuc.lib.siu.edu/tpr/vol48/iss3/7